JPS5912269A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to control of the rotational speed of a blower that blows air to a condenser of a refrigeration system.

(b) Conventional technology In general, the indoor load is high even in the middle and winter months when the outside air temperature is low (if cooling or refrigeration is required, a refrigeration system is operated. The amount of heat exchanged in the condenser was changed in accordance with the change in the temperature of the container, and operation was carried out during the intermediate and winter seasons.As a means of controlling the amount of heat exchanged, for example, the condenser was water-cooled, and the cooling water was The number of revolutions of this blower was varied by controlling the flow rate of the blower and by making the condenser air-cooled.

(c) Problems with the conventional technology With such a conventional technology, when the outside air temperature is detected and the heat exchange amount of the condenser is changed, there is no correlation with the load condition and the pressure balance and capacity balance cannot be properly achieved. The compressor could be damaged and could only be roughly controlled. In addition, when the temperature of the condenser is detected, it is possible to determine the load condition to some extent, but the ability to follow changes in the amount of heat exchanged by the condenser is poor, resulting in control delays and damage to equipment such as the compressor. . In any of the above cases, only rough control can be performed, which consumes energy and labor, and stable operation cannot be performed, resulting in unsatisfactory results.

B) Purpose of the Invention The purpose of the invention is to ensure stable operation of a refrigeration system even during the intermediate and winter seasons.

(E) Key Points of the Invention The non-invention is a refrigeration system in which a compressor, a condenser, and a pressure reducing element evaporator are connected in a ring to form a refrigeration cycle, including an outside temperature sensor that detects the outside air temperature, and an outside temperature sensor that detects the temperature of the condenser. By providing a condenser temperature sensor that controls the temperature of the condenser, and a controller that determines the rotational speed of the blower that blows air to the condenser based on the temperatures detected by both sensors, the capacity of the condenser can be maintained at an optimal level in response to changes in outside air temperature and load. This is how it was done.

(f) Embodiments of the Invention An embodiment of the present invention will be explained based on FIGS. 1 and 2. In FIG. 1, (1) is an outdoor condenser (2), an indoor evaporator (3). ), the compressor (4) is connected in a ring with the pressure reducing element (EXP) to form a refrigeration cycle, and the outside temperature sensor (4) measures the rotational speed of the blower (5) of the condenser (2).
6) and a condenser temperature sensor (a controller determined from the output of force) as shown in Figure 2.In other words, (8) is an outside temperature sensor (6) with a negative characteristic thermistor, and a condenser temperature sensor with a negative characteristic thermistor. Temperature sensor (force, resistance (9), 0
0), a temperature difference output circuit that outputs the difference between the outside air temperature and the temperature of the condenser (2), which is composed of a variable resistor 0υ for adjustment and an active element circle, and the output of the temperature difference output circuit (8) that outputs the difference between the outside air temperature and the temperature of the condenser (2), and is described later. (I4) is an adder circuit that adds the return output of return circuit 4 to
) is a comparison N path that outputs the difference between the output of the reference voltage generation circuit and the output of mark 0, and α9 returns to the comparison circuit 03) and the reference voltage generation circuit (the difference between the output and the country is added to the addition circuit 03). The loop circuit is a comparator circuit (i is an oscillation circuit that changes the oscillation frequency depending on the output voltage of tin, and resistors (21), (22), (23)
), (24), capacitor? 51 and PUT element (2
6).

(2η is the blower (
The triac controls the energization time to 5), which controls the rotational speed of the fan (5) 17) Since the non-inventive embodiment is configured as described above, the refrigeration system starts operating. When the controller (4) is energized, a predetermined reference voltage is generated from the reference voltage generation circuit (08), and at the same time the outside temperature by the outside air temperature sensor (6) and the condenser temperature sensor ( The difference between the temperature of the condenser (2) and that of the condenser (2) due to the power is output.Next, in the adding circuit (13), the output of the return circuit 0I is returned to the output of the temperature difference output circuit (8), thereby controlling the automatic control. A loop is formed, and the adder circuit (compares the output of 1 and the reference voltage and calculates the difference between the comparator circuit 04) outputs the output to the return circuit [9] and also outputs it to the oscillation circuit. Therefore, the oscillation circuit (The energization time to the blower (5) is controlled according to the oscillation frequency of the blower (
5) The rotation speed is determined.

After that, the outside air temperature decreases and the difference between the outside air temperature and the temperature of the condenser (2) becomes large (then the output of the temperature difference output circuit (8) becomes large, and the output that exceeds the adder circuit (131) is compared. Circuit Q4
), the difference from the reference voltage becomes smaller in this circuit, and the output voltage to the oscillation circuit T20) becomes smaller. Therefore, the oscillation frequency of the oscillation circuit (a) becomes lower and the time during which the blower (5) is energized becomes shorter, the rotational speed of the blower (5) decreases, the amount of heat exchanged with the outside air is reduced, and the condenser (2) can maintain a constant heat exchange capacity.

In addition, when the outside temperature rises, the differential temperature output circuit (8)
The output of the oscillation circuit (A) becomes smaller, and the difference with the reference voltage becomes larger in the comparison circuit 04), and the output voltage to the oscillation circuit (2υ) becomes larger. Therefore, the oscillation frequency of the oscillation circuit (A) becomes higher (
As a result, the time when electricity is applied to the blower (5) becomes longer, and the blower (
The rotational speed of the condenser (5) increases, increasing the amount of heat exchange with the outside air and keeping the heat exchange capacity of the condenser (2) constant.

As mentioned above, the invention is capable of keeping the capacity of the condenser (5) constant by varying the rotational speed of the blower (5) according to the difference between the outside air temperature and the temperature of the condenser (2). be.

Incidentally, in the present invention, a controller according to the invention may be configured using a control means such as a computer, or the rotational speed of the blower may be changed from stepless to multiple steps.

(g) Effects of the invention The uninvented refrigeration system is equipped with a controller that detects the outside air temperature and the condenser temperature and sets the rotation speed of the condenser blower, so when the outside air temperature is low during the mid-season or winter. In any case, it is possible to obtain an appropriate condenser capacity commensurate with the load condition. Therefore, damage to the compressor due to problems such as pressure balance and capacity balance can be prevented, and the refrigeration system can be operated stably throughout the year since there is no capacity drop in the evaporator, which is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of the inventive device, and FIG. 2 is an electric circuit diagram of the controller in FIG. 1. (1)...Compressor (2)...Condenser (3)
... Evaporator (4) ... Controller (5) ... Air blower (EXP) ... Pressure reducing element Fig. 1

Claims (1)

[Claims] (1) In a refrigeration system in which a compressor, a condenser, and a pressure reducing element evaporator are connected in a ring to form a refrigeration cycle, an outside air temperature sensor that detects outside air temperature and a condenser source sensor that detects the temperature of the condenser are used. and a controller that determines the rotational speed of a blower that blows air to the condenser based on the temperatures detected by both of the sensors.